A decorator factory is a function that returns a decorator based on the arguments you pass in. Sometimes you make a decorator factory to cover uncommon use cases. In that case you'll probably use default arguments to cover your common case.

The recipe provides an easy-to-use class for a group of "constants". It provides helper functions for getting the constant values just right. It also exposes the mechanism it uses to bind the contents of an iterable into the namespace...

This may sound too good to be true, but see for yourself. No time machines involved. Just plug in this metaclass and look for __newclass__ in your class body. It's not perfect, but the problematic corner cases are more bark than bite.

Abstract Bases Classes in Python provide great features for describing interfaces programmatically. By default a subclass is validated against all its ABC parents at instantiation time (in object.__new__). This recipe aims to provide for...

Python already provides immutable versions of many of the mutable built-in types. Dict is the notable exception. Regardless, here is a protocol that objects may implement that facilitates turning immutable object mutable and vice-versa.

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